Servalan investigates a planet which contains an unknown substance of potential usefulness whose investigation team mysteriously died. The crew learn of Servalan's trip and decide to investigate for themselves.
| Name | Type | Role | |
|---|---|---|---|
| Tanith Lee | Writer | ||
| Jonathan David | Guest Star | ||
| Michael Gaunt | Guest Star | ||
| Stephen Yardley | Guest Star | ||
| Daniel Hill | Guest Star | ||
| Peter Craze | Guest Star | ||
| Vivienne Cozens | Director |